type TStu = {
  name: string
  sex: string
  score: number
  height: number
  // study?(): void
  study?: () => void
  play?: (type: string) => void
}

const stu1: TStu = {
  name: 'zs',
  sex: '男',
  score: 99,
  height: 170,
  study() {},
  play(type) {
    console.log(type)
  },
}

const stu2: TStu = {
  name: 'ls',
  sex: '男',
  score: 99,
  height: 170,
}
